/Engine/Source/Editor/UnrealEd/Public/Subsystems/EditorAssetSubsystem.h
Set the value associated with a given tag of a loaded asset's metadata.
void SetMetadataTag ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * Object, [FName](API\Runtime\Core\UObject\FName) Tag, const [FString](API\Runtime\Core\Containers\FString) & Value )